Physiological regulatory responses and subjective sensations of human in thermal adaptable threshold zone

 Studies the adaption characteristics of northern and southern subjects with different thermal experience backgrounds in thermal adaptable threshold zone. Selects 16 southern subjects and 16 northern subjects, tests five physiological parameters including skin temperature, heart rate, heart rate variability, respiratory rate and blood volume pulse, and conducts the subjective questionnaire surveys. Simultaneously tests the environmental parameters. The results show that the subjective feeling of the southern subjects is better than that of the northern subjects, the average skin temperature, respiratory rate and blood volume pulse are slightly higher than those of the northern subjects, and the heart rate and low frequency / high frequency ratio of heart rate variability are slightly lower than those of the northern subjects. From the neutral environment to the thermal adaptation threshold zone, the experimental period of southern subjects showing a significant difference is later and less than that of northern subjects from aspect of subjective sensations, but from aspect of physiological responses, the differences in the mean value are approaching. Although the physiological regulation responses of the northern and southern subjects are approaching, the southern subjects have better thermal environment endurance and thermal acclimatization ability because of their indoor and outdoor thermal experience background.